Remove one instance of invisible metatag.
Remove one instance of invisible metatag.

A 'category' metatag with the value 'CDH'.

There's one other instance of this metatag,
but it's in impala_cdh.xml which is getting
deleted in a different code review.

Change-Id: Ic0001cd027435f1a8a4fd02ad28e169313e5a6f4
Reviewed-on: http://gerrit.cloudera.org:8080/5627
Reviewed-by: Jim Apple <396f577ccd0f19e47f0fb44dae1d6fc43cc20400@apache.org>
Tested-by: John Russell <308573a947c636ab812b35943b6242633bef8113@cloudera.com>

michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala,michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,michaelhkw/incubator-impala